Convert kcal to kJ
1 kilocalorie equals 4.184 kilojoules. To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184: for example, 10 kcal is 41.84 kJ. Ethical Tube's free kcal to kJ converter does the math as you type, and the chart below lists common values.
1 kcal = 4.184 kJ
- 1 kcal
- 4.184 kJ
- 1 kJ
- 0.239006 kcal
- Formula
- kJ = kcal × 4.184
- Measures
- Energy
- Price
- Free
- Works offline
- Yes
Conversion chart
kcal to kJ chart
| Kilocalories (kcal) | Kilojoules (kJ) |
|---|---|
| 1 kcal | 4.184 kJ |
| 2 kcal | 8.368 kJ |
| 3 kcal | 12.552 kJ |
| 4 kcal | 16.736 kJ |
| 5 kcal | 20.92 kJ |
| 6 kcal | 25.104 kJ |
| 8 kcal | 33.472 kJ |
| 10 kcal | 41.84 kJ |
| 12 kcal | 50.208 kJ |
| 15 kcal | 62.76 kJ |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
How it works
How to convert kcal to kJ
Know the formula
kJ = kcal × 4.184. In words: multiply the number of kilocalories by 4.184.
Work an example
10 kcal → 41.84 kJ. Round to two or three decimal places for everyday use.
Or type it in
Enter any value in the converter above and the answer appears instantly, in both directions.
Good to know
About energy units
- Food labels use kilocalories (kcal), often written as Calories with a capital C. 1 kcal is 1,000 calories, or 4.184 kilojoules.
- This converter uses the thermochemical calorie (4.184 joules) and the international BTU (1,055.06 joules).
FAQ
Questions, answered
How many kilojoules are in a kilocalorie?
There are 4.184 kilojoules in 1 kilocalorie. To convert kilocalories to kilojoules, multiply the number of kilocalories by 4.184.
What is 10 kcal in kJ?
10 kilocalories is 41.84 kilojoules.
How do you convert kJ back to kcal?
Multiply the number of kilojoules by 0.239006. 1 kilojoule is 0.239006 kilocalories.
Is this kcal to kJ converter free?
Yes. It's free and works in any browser, even offline once the page has loaded. The answer updates as you type, and nothing you enter is sent anywhere.
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